7
7.0

Sep 22, 2013
09/13

by
A. Chamorro; K. S. Virbhadra

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7

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The energy associated with a static and spherically symmetric charged dilaton black hole is obtained for arbitrary value of the coupling parameter (which regulates the strength of the coupling of the dilaton to the Maxwell field) $\beta$. The energy distribution depends on $\beta$, whereas the total energy is independent of this and is given by the mass parameter of the black hole.

Source: http://arxiv.org/abs/gr-qc/9602005v1

24
24

Jul 20, 2013
07/13

by
A. Chamorro; K. S. Virbhadra

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24

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0

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0

It is known that certain properties of charged dilaton black holes depend on a free parameter $\beta$ which controls the strength of the coupling of the dilaton to the Maxwell field. We obtain the energy associated with static spherically symmetric charged dilaton black holes for arbitrary value of the coupling parameter and find that the energy distribution depends on the value of $\beta$. With increasing radial distance, the energy in a sphere increases for $\beta = 0$ as well as for $\beta...

Source: http://arxiv.org/abs/hep-th/9407187v3

13
13

Sep 23, 2013
09/13

by
A. Chamorro; K. S. Virbhadra

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13

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0

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We give a non-static exact solution of the Einstein-Maxwell equations (with null fluid), which is a non-static magnetic charge generalization to the Bonnor-Vaidya solution and describes the gravitational and electromagnetic fields of a nonrotating massive radiating dyon. In addition, using the energy-momentum pseudotensors of Einstein and Landau and Lifshitz we obtain the energy, momentum, and power output of the radiating dyon and find that both prescriptions give the same result.

Source: http://arxiv.org/abs/hep-th/9406148v2

6
6.0

Sep 19, 2013
09/13

by
S. S. Deshingkar; S. Jhingan; A. Chamorro; P. S. Joshi

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6

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0

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We consider here the effects of a non-vanishing cosmological term on the final fate of a spherical inhomogeneous collapsing dust cloud. It is shown that depending on the nature of the initial data from which the collapse evolves, and for a positive value of the cosmological constant, we can have a globally regular evolution where a bounce develops within the cloud. We characterize precisely the initial data causing such a bounce in terms of the initial density and velocity profiles for the...

Source: http://arxiv.org/abs/gr-qc/0010027v1

5
5.0

Sep 19, 2013
09/13

by
J M Aguirregabiria; A Chamorro; K S Virbhadra

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5

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0

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We show that the pseudotensors of Einstein, Tolman, Landau and Lifshitz, Papapetrou, and Weinberg (ETLLPW) give the same distributions of energy, linear momentum and angular momentum, for any Kerr-Schild metric. This result generalizes a previous work by G\"urses and G\"ursey that dealt only with the pseudotensors of Einstein and Landau and Lifshitz. We compute these distributions for the Kerr-Newman and Bonnor-Vaidya metrics and find reasonable results. All calculations are performed...

Source: http://arxiv.org/abs/gr-qc/9501002v3

5
5.0

Sep 19, 2013
09/13

by
A. Chamorro; S. S. Deshingkar; I. H. Dwivedi; P. S. Joshi

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5

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0

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A piecewise Tolman-Bondi-Lemaitre (TBL) cell-model for the universe incorporating local collapsing and expanding inhomogeneities is presented here. The cell-model is made up of TBL underdense and overdense spherical regions surrounded by an intermediate region of TBL shells embedded in an expanding universe. The cell-model generalizes the Friedmann as well as Einstein-Straus swiss-cheese models and presents a number of advantages over other models, and in particular the time evolution of the...

Source: http://arxiv.org/abs/gr-qc/0010063v1

14
14

Sep 18, 2013
09/13

by
J. M. Aguirregabiria; A. Chamorro; L. P. Chimento; N. A. ZuccalĂˇ

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14

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0

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We use exact general solutions for the spatially flat FRW and the anisotropic Bianchi I cosmologies to show that generically uncoupled scalar fields cooperate to make inflation more probable, while the presence of several interacting fields hinders the occurrence of the phenomenon, in accordance with previous results based on particular power-law solutions. Similar conclusions are reached in the case of Bianchi VI$_0$ spacetimes, for power-law solutions which are proved to be attractors.

Source: http://arxiv.org/abs/gr-qc/0006108v1

36
36

Sep 24, 2013
09/13

by
D. D. Stancil; P. Adamson; M. Alania; L. Aliaga; M. Andrews; C. Araujo Del Castillo; L. Bagby; J. L. Bazo Alba; A. Bodek; D. Boehnlein; R. Bradford; W. K. Brooks; H. Budd; A. Butkevich; D. A. M. Caicedo; D. P. Capista; C. M. Castromonte; A. Chamorro; E. Charlton; M. E. Christy; J. Chvojka; P. D. Conrow; I. Danko; M. Day; J. Devan; J. M. Downey; S. A. Dytman; B. Eberly; J. R. Fein; J. Felix; L. Fields; G. A. Fiorentini; A. M. Gago; H. Gallagher; R. Gran; J. Grange; J. Griffin; T. Griffin; E. Hahn; D. A. Harris; A. Higuera; J. A. Hobbs; C. M. Hoffman; B. L. Hughes; K. Hurtado; A. Judd; T. Kafka; K. Kephart; J. Kilmer; M. Kordosky; S. A. Kulagin; V. A. Kuznetsov; M. Lanari; T. Le; H. Lee; L. Loiacono; G. Maggi; E. Maher; S. Manly; W. A. Mann; C. M. Marshall; K. S. McFarland; A. Mislivec; A. M. McGowan; J. G. Morfin; H. da Motta; J. Mousseau; J. K. Nelson; J. A. Niemiec-Gielata; N. Ochoa; B. Osmanov; J. Osta; J. L. Palomino; J. S. Paradis; V. Paolone; J. Park; C. Pena; G. Perdue; C. E. Perez Lara; A. M. Peterman; A. Pla-Dalmau; B. Pollock; F. Prokoshin; R. D. Ransome; H. Ray; M. Reyhan; P. Rubinov; D. Ruggiero; O. S. Sands; H. Schellman; D. W. Schmitz; E. C. Schulte; C. Simon; C. J. Solano Salinas; R. Stefanski; R. G. Stevens; N. Tagg; V. Takhistov; B. G. Tice; R. N. Tilden; J. P. Velasquez; I. Vergalosova; J. Voirin; J. Walding; B. J. Walker; T. Walton; J. Wolcott; T. P. Wytock; G. Zavala; D. Zhang; L. Y. Zhu; B. P. Ziemer

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36

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Beams of neutrinos have been proposed as a vehicle for communications under unusual circumstances, such as direct point-to-point global communication, communication with submarines, secure communications and interstellar communication. We report on the performance of a low-rate communications link established using the NuMI beam line and the MINERvA detector at Fermilab. The link achieved a decoded data rate of 0.1 bits/sec with a bit error rate of 1% over a distance of 1.035 km, including 240...

Source: http://arxiv.org/abs/1203.2847v2